Grinding machine



June 20; 1944.

E. SCHQTTLAND GRINDING MACHINE Fiied Jan. 28, 1945 2 Sheets-Sheet 1 INVENTOR. EDWARD SCHOTTLA/VD.

ATTORNEYS.

WITNESS.

June 20, 1944. sbHOTTLAND 2,351,881 GRINDING MACHINE I I Filed Jan. 28, 1943 2 She ets-Sheet\2 F133. I

709 V INVENTOR. fan/A R0 Scwo 774 A N0.

Patented June 20, 1944 NI j Edward SchottlancL'Forest Hills, N. Y., assignor of one-half to- Robert Schottland, Jackson Heights, N. Y;

- s Application January 28, 19.43, Serial 1 Claims. I (01:51-103) This invention relates to improvements in grinding machines and more particularly it pertains to machines for grinding the edges of circular plates and similarobjects. y

One specific use to which the invention has been specifically adapted is for the grindinglof the peripheral edges of circular plates of glass in the manufacture of mirrors and other articles formed from glass plates circular in form;. V

It is one object of the invention toprovide a machine which will operate simultaneously on more than two articles. .2 It is a further object of the invention; to provide a device'which may be employed in connec ticn with a grinding wheel of the type commonly. g

employed for finishing the edges of rectangular plates of glass. r

. It is a still further object of the invention so to construct the machine that the time required: to produce the finished edge upon the article being treatedmay be considerably reduced as compared with machines at .presentin use with which I am familiar. p

Other-objects of the invention will appear as the nature thereof is' better understoodforwhich purpose reference will now be had to the accompanying drawings andthe. following specification.

- In the drawings, v s

' Figure 1 is a top plane view of the machine con.-: structed in'accordance with the present-.invena tion,

Figure 2 is a transverse vertical'sectional view thereof taken substantially on the line..2-2 of Figurel,

Figure 3 is a view in end elevation looking at the right hand end of the machine as illustratedinFigurel, a a i Figure 4-is a' detail sectional view'on anen.- larged scale taken substantially on the line 4-4 of Figure2, and, r

V Figure 5 is a viewin side elevation illustrating. a slightly modified formof the invention.- a; Referring to thedrawings. by reference. character, the-machine includes a suitable supporting, baseor frame l0, havinglegs II and feet.. l2.v sup-.7 porting the same. Carried by thebase All there.

passing around a pulley-24 carried .bythe shaft 25rupon which the grinding wheel is'mou'nted.

.Water or other suitableliquidis admitted to the housingsby means .of: a spray nozzle or the like 2B,.and carried off from. the grinding wheel housing by pipes 26'. J l :mAsv heretofore stated, the. grinding .wheel is of a conventional type having atplurality of spaced grooves formed in its peripheral edge which extend entirely around the grinding wheel. :This grinding wheel being of the conventional type forms no part ofthe present invention except in combination with; thoselfeatures alleged .:to be new. 5

.-.'Ihe reference numeral: 50 designates a. rigid frame which comprises-two side members 5|. and 52 reconnected together in spaced. relation by a plurality .of braces Orcross members 53', seeFig-. ure 1..; This frame may be formed as an integral part-:ofqthe base, heretofore mentioned, and is s pported above the sameand above the grind-. ing wheel by four; extensions, there being two extensions [6 ori'theiright hand side of themachine and two extensions l! on the left hand side. thereof. s Q

Depending from the left hand .edge of each of the side members 152 of the, frame 50, there isjan extension .54 which is provided-with an elongated slot 55.. .Adjustablymounted on each of these extensions 54 there is a bar or the like .56. and bolts :51 are employedtosecure the bars or members'. 56 in an adjustable position vertically of theframe 50.

Referring to Figure 3,;itiwill be noted that a shaft 58 is m0unted in .the :upper end of thebars or members 56 which is secured in positionvthe rein. by meansiof a nut or the like 59. y This shaft 58 extends forwardly of the machine and two spaced levers: 60 are pivotally mounted thereon and; held .in 1 spaced relation .by-means .:of "a sleeve BLinterposed between the levers. The free ends is a housing I3, having an: opening I! inthe. topwalllithereof. a A Mounted in the'base llljin suitablebearings there is a grinding wheel 2l-, the.peripheral .edge

The reference character 21 designates a. reetangular frame comprising two; side members 28 O e l v s 60 are connectedbv a cross member or thelike 62. i' i As best illustrated in mate 2, each of these we s liis r v d d w than el ted s ot and, adjustably mounted in these slots between the levers 60 there; is a roller 64. Asbest illustrated in Figure 3, this roller .64 has a plurality of peripheralgrooves 65,.thespecific purpose- 0f which will be hereinafter described.

connected byone or more transverse membersv 29.. frame is pivotally mounted on theshaft;

31 T i i l t blymmntedlm w }ca r v vided with a plurality of spacedgrooves 34, the

purpose of which will be hereinafter more specifically described.

The construction just described is illustrated in detail in Figure 4, the roller 33 :being secured to the reduced extension 35 of the shaft3ll by means of a nut 35'.

The frame 21 heretofore mentioned, is provided in its left hand end with a bearing 36 which receives the shaft 30, and this construction forms the means by which the frame '21 may be pivotally mounted within the frame 50 as best illustrated in Figures 1 and 2.

Each 'of the side. members 23 of the frame. 21 is provided with amelongated slot 3] and. adjust able along these slots'therle is a shaft 38. which has its forward endnextendingbeyond the. side member 52 of the frame 5041's best illustrated in Figure 1. Mounted upon the forward extension of the shaft 38 there'isa roller 39. which is provided with a plurality of. spaced grooves 40, the. pur-. pose. of whichwill be hereinafter specifically described. 1

Connected to the cross member 62 of thelevers 63 by ahook or. the like 4l there is a. coil spring 42, the lower end ofwhich is attached to a link or the like pivotally connected as at 44 toma foot treadle 45. This. foot: treadle '45 is connected for engagement -'and= di'sengag.ement with a yielding spring ac-tuated toothed bar- 45: pivotally mounted as at 46 bymeans of which the the;foot treadle 45'maybe held in adjustable position thereby to place theispring .42 under 'desired tension. .The foot-treadle 45. is pivotally mounted-upon the basel0. asat 41.. r I

Mounted at the. outer ends ofthe side 'mem'-. bers 28 of the frame 21, thereis-a crossbar and a best illustrated in Figure 3 of the drawings, there are two springs: H which are connected at theirlower ends asat 12 to the cross bar 10, the upper ends-of the springsbeing connected as at 13 to one of "the 'cross inembers 530i theframe 50.-

- The reference: charactenA designates the-cm cular plates to beoperated 'upon,.herein illus? trated as plates of glass, the edges of which are to be finished by grinding. -In the presentinstance, there are six of these plates 'shown and the manner in which the grincling of" theedgesof these plates is simultaneously carried 'out will now be describedi i H The several rollers 33, 33 and 64 are so supported that the grooves in each roller w ill aline with the. corresponding grooves-in "ea-ch. of the otherrollersand' with the corresponding g-ro'oves in the grinding wheel.-

The roller 33 constitutes'a fixed-point and the pulley 3l carried upon the shaft-to whichthis roller isattached is driven by means of a-belt or the like 80 in a manner which will be-hereinafter-described; The plates A, the-edges offiwhich 'areto be ground, are supported by the 'flxed roller 33*andf the roller 39 carried by the frame21.- Under by the left hand extensions ll, heretofore menwardly about its pivotal point upon the shaft 30, these springs having suflicient tension so to support the plates in such position.

To position the plates it will be understood that the foot treadle 45 is released to permit of the lifting of the frame 50'to place the plates upon the rollers 33 and 39.

After the plates have been positioned, the

frame 50 is lowered to the point where its roller 64 will engage the plates, after which the foot treadle is depressed to place the spring 42 under suflicient tension to move the edges of the plates into position within their respective grooves in the peripheral edge of the grinding wheel 2| in grinding contact with said grinding wheel.

In the preferred form of the invention, the grinding wheel would be continuously operating in the direction indicated by the arrow B. The belt 80, heretofore mentioned, is driven by means of a pulley 8| carried upon a shaft 82 to which is connected a gear 83 which meshes with a. driving gear 84 carried by'the shaft'25 of the motor, and thus it willbe seen thatthe belt will be driven in the direction of the arrow C, operating the driving pulley 3|, the shaft 30 and the roller 33. which constitutes a driving roller for the plates, driving them in a direction opposite to that of the rotation of the grinding wheel 21.

From the foregoing, it will be apparent that the frame by reason o-f the fact'that it is pivotally mounted upon the shaft 30 and the fact that the springs H tend to move the frame away from the grinding wheel and the spring 42 tends to overcome the tension of the springs H maintaining the plates A in engagement with the grind ing wheel, the several plates are yieldingly mounted with respect to the grinding wheel, and are yieldingly supported by the rollers 33 and 39 and held yieldingly in engagement with said supporting rollers 33and 33 by the roller 64..

The supporting rollers 33 and 39 engage; the circular plates at spaced points below their centers. while the roller 64 engages the plates at a point above the center, thus providing a three point engagementwith the plates, to insure their proper positioning with. respect tothe grinding;

wheel.

Afterv the edges of the plates; have been; sufllcientlyiground, they may be: removed and: finished' by-wbufling or any other desired convemtional method. a

In the: modified. form. of. the. invention illus trated in-Figure 5-of the drawings, the platesA are illustrated as being'supported upon two'roll ers '9 0' and; 3| and; held in engagement therewith by=meansof a roller 3.2-.

In this type of device, the roller 9| which-con stitutes a driving. and supporting; roller forEthe plates, is .mounteds on 'aEshaft; 94 mounted in suit able bearings supported by the frame='93.- This; roller-is-xdriven bys'a belt 3,3 from any suitable source of-powenunotjshownr The rollers 91! and: BZFJarefcarried by; arframelike element 962 which .isipi-votally :mounte'd upon. the shaft 34. .Tliis framelike .memberziszprmvided with an: elongated; fsl'ot aili'in whichizthe: roller Slly'm'ay be adjusted: andi it. haszarr'jupe standing arm 98 which is slotted asatsBSi Slideably --'mounted in the slot 39 of the arm samere is a block I'll-ligand: the roller =9 2; .li'ere'toifore :mentioned, is 'rotatably; mounted u 'norizlsaidi block;- Connectel/to'the b1OCk inmfaS &ti l'0l fthere' isgai coil sprin -g1 02 whi'dl'i is': alsoggonnected to hei framelike member efi as at lllil 1v frorn'the-grinding wheel I04, ff

neon-sear 9:3.1' spring is undertension andntend s' ,nor,-. 1

-mallyito move the.v plates ,A', iii a directionaway Means is provided, .nq'wev for-'mairitai'ning en agement ofgthe plates with the grindingwheel and; this means inlay. constitute, eith I spring one weight, not 'shown,.f,connected a hat 'l.08"to the pivoted frame-like'member 96 fnd t's f r in the;direction "f thearrow m9 ag the'tension of thejspringlqfi, 1 "From the for g in it wil e' a p r lf h in this modified form of .the inventionjthejplates tofbe operatedupon are Supp d y'the o ler 90 and 9| and are retained in engagementtherewith in a yielding manner by means of theftension supplied by thespri'ng I02 vuponthe roller jiiz. Furthermore, it'wi1l noted that, 'by'frea'son of the pivotal mounting of the frameglik mem ber 96, the tension provided by the spring'lflS and the force appliedjthereto in the direction of the arrow I09, said frame-like memberis also yieldingly mounted with" respectto the grindingwheel 3 l In this form of the invention it is: to'be understood that the several muerseo, 9| and 9? will be provided with a 'pluraIityof-circumfer ential grooves to receive a plurality of-plates as in the preferred form of the invention; 1 i 1 From' the foregoing, it will be apparent that the present invention provides a -machine- 'for grinding the peripheral edges of circular plates in which a comparatively large number of plates may be operated upon-simultaneously andf in which, by reason of the' fact'thatthe plates are rotated in a direction opposite toithe direction of the rotation of the 'grinding'whe'eL'the opere" driving roller and the supporting roller,'and in grinding. contact with. the grinding element, means fer exerting pressure upon said'spressure roller, and means for driving the driving roller.

2. In a machine for grinding the peripheral edge of a circular plate, a rotating grinding wheel, means for rotating the grinding wheel, a frame, a fixed position plate supporting and driving roller carried by the frame, a lever pivotally mounted on said frame, a plate supporting roller carried by the lever, said rollers having engagement with the peripheral edge of a circular plate to be ground at spaced points upon one side of the center of said plate, means tending normally to move the pivoted lever in a direction away from the grinding element thereby to move the peripheral edge of a plate to be ground out of grinding contact with the grinding element, meansfor rotating the supporting and driving roller thereby to rotate the plate, and means for applying a yielding pressure to the plate to retain its peripheral edge in grinding contact with the grinding element.

3. In a machine for grinding the peripheral edge of a circular plate, a rotating grinding wheel means for rotating the grinding wheel, a frame,

a fixed position plate supporting-and driving roller carried by the frame, a leverpivotally mounted on said frame, a plate supporting roller carried by the lever, said rollers having engagement with the peripheral edge of a circularplate :to be ground at-spaced points upon one side of the center of said plate, means tending normally to move the pivoted lever in a direction away from the, grinding element thereby to; move the peripheral edge of a plate to be ground out of grinding contact with the grinding element, means for rotating the supporting and driving roller thereby to rotate the plate, and means for applying a yielding pressure to the plate to retain its peripheral edge in grinding contact with the grinding element, said last mentioned means including a roller having engagement with the peripheraledge of the plate being ground at a point upon the opposite side of, the center of the plate from those points of engagement of said plate by the supporting and driving roller and the said supporting roller, and means for apply ing pressure to said pressure roller. I

4; A machine for grinding the peripheral edges of circulating glass plates comprising in combination, a rotating grinding wheel, means for rotating said grinding wheel, a frame, 'a' lever pivotallyimountedon saidframe, a glass-plate supporting roller carried by said lever, a spring con-. nected ,to'the frame, and to. the lever andtending to move thelever in'a direction away from .the grinding element, afliied positionsupportingand drivingroller mounted upon the frame and co operatingwith the first mentioned roller to sup- Bis fill

port a circular glass plate, with, its peripheral edge in grinding contact with the grinding wheel a second lever pivotally mounted upon the frame, a pressure roller carried by said second pivoted lever,v and adapted forengagement with the peripheral edgeof the glass pl'ate'to be ground infc'ipposition to said aforementioned rollers to hold the glass plate'inposition, yielding means acting'in opposition to said firstmentioned spring for movin'gthe glass plate to position'with its peripheral edge in] grinding contact with the grinding wheel, and means for driving said driv-. in'g'and supporting roller. v Q

5 ma machine of the type describedin' combi-. nation, a supportingframe, a grinding wheel, a combined plate I driving and supporting roller carried bythe' supporting frame, means for drivin'g "said roller, aj fram'e' member mounted for pivotal' m'ovement about the axis of the combined plate driving and supporting roller, a plate supporting roller carried by said pivotally mounted frame member in spaced relation to the plate driving and supporting roller, a yieldingly mounted plate engaging roller for maintaining aplate in yielding engagement with the plate driving and supporting rollers, a grinding element and means for moving the frame member and a plate carried thereby into engagement with the grinding element.

6. In a machine of the type described in com- I carried by the supporting frame, means for driving said roller, a frame member mounted for pivotal movement about the axis of thecombined plate d'riving and supporting roller, a plate sup "a-re'silientmember for providing yielding grind:

ing engagement'between the plate to beground and the grinding wheel. 7

'7. In a machine of the type described in com bination, a stationary supporting frame, a plate driving and supporting roller carried by said frame, means for driving's'aid roller, a pivoted about the axis of the driving and supporting roller, a plate'supporting roller adjustably mounted on the pivoted frame in spaced relationto 'said plate driving and supporting roller, athird roller slidably-mounted on the pivoted frame and movable into engagementwith a plate supported upon the two first mentioned rollers,"means for moving the slidingly mountediroller into engagement with a plate for yieldinglyretaining the plate in engagement with the supporting and driving roller and the supporting roller, a grinding wheel, and means for'retaining the plate carried by the pivoted from in grinding contact with the grinding wheel. 7 l

'8 In a machine of the type described in combination, a stationary supporting frame, a plate driving and supporting roller carried by said .frame, means for driving said roller, a pivoted frame member mounted for pivotal movement about the axis of the driving and supporting roller, a plate supporting roller adjustably mounted on the pivoted frame in spaced relation to said plate driving and supporting roller, a third roller slidably mounted on the pivoted frame and movable into engagement with a plate supported upon the two first mentioned rollers, means for mov'ingthe slidinglymounted roller into engagement with a plate for yieldingly retaining the plate in engagement with the supporting and driving roller and the sup-- porting roller, a grinding wheel, and means for retaining the plate carried by the pivoted frame in' grinding contact with the grinding wheel, said last mentioned means including means tending normally to move the pivoted frame in a direc tion away from the grinding wheel and means for moving the pivoted frame in the direction of the grinding wheel in opposition "thereto. v

9. In a machine of the type described incom; bination, a stationary supporting frame, a plate :3 frame member mounted for pivotal movement ingly retaining theplate in engagement with the supporting andbriving'roller'and the supporting roller, a grinding wheel, and means for retaining the plate carried oby'the pivoted frame in grinding contact with the grinding wheel, said last mentioned means including a coilspring connected at one end tofth'e' pivoted frame for moving the pivoted'frame 'in a direction away from the grinding wheel, and means for moving the pivoted frame in the direction of the grinding wheel in opposition to the force of said pri a I 10. In a machine of the. type described in combination, a stationaryfsupporting frame, a plate driving and supporting roller carried by said frame, means for driving said roller, a pivoted frame mounted for pivotal movement about the axis of the driving and supporting roller, 3, plate supporting roller adjustably mounted upon the pivoted frame in spaced relation to said plate driving and supporting roller, a grinding wheel, a coil spring connected at one end to the stationary frame and at its other end to the pivoted frame for normally supporting the pivoted frame in a position to support a plate carried thereby out of contact with the grinding wheel, a lever pivotally and adjustably mounted onthe stationary frame, a plate engaging roller carried bysaid pivoted lever an means for rocking the pivoted lever about its pivotal point to retain a plate inoperative position in the pivotedframe upon the driving and supporting roller and the'supporting roller aforementioned, said means also serving to move'the pivotal frame in the direction of the grinding wheel to bring a plate carried thereby into operative engagement with the grinding wheel.

11. In a machine for grinding the peripheral edge of a circular plate, a grinding element, a driving roller having engagement with the peripheral edge of a circular plate to be ground, a supporting roller having engagement withthe peripheral edge of said plate, a pressure roller engaging the peripheral edge of said circular plate and ,in grinding contact with the grinding element, means for exertingvpressure upon said pressure roller, and means for driving the drive ing roller. l

EDWARD. SCHOTTLAND. 

